Multi upload Symfony 2.3 with Dropzone

First of all, you don't really use your FileUploadType in the Twig template. You create a form manually and set the action path to the url you defined in your Controller. The only thing you use from the form view you pass to the template is the form_enctype. But like most multi file uploaders, Dropzone seems to forge its own request to upload an Image.

This means you also have to handle the incoming data manually.

/** * @Route("/admin/media/upload") * @Template() */public function showUploadAction(){    // just show the template    return [];}/** * @Route("/admin/media/upload/process", name="upload_media") */public function uploadAction(){    $request = $this->get('request');    $files = $request->files;    // configuration values    $directory = //...    // $file will be an instance of Symfony\Component\HttpFoundation\File\UploadedFile    foreach ($files as $uploadedFile) {        // name the resulting file        $name = //...        $file = $uploadedFile->move($directory, $name);        // do something with the actual file        $this->doSomething($file);    }    // return data to the frontend    return new JsonResponse([]);}

The method uploadAction takes the FileBag from Symfony's request, iterates over it, and performs your custom logic on the resulting file. Of course you have to handle the storage of the File entity by yourself.

Your template should look like this:

<form action="{{ path('upload_media') }}" method="post" class="dropzone">    <div class="fallback">        <input name="file" type="file" multiple />    </div></form>

Symfony requires that every form contains a csrf-token. Your form doesn't contain one so symfony tries to use your "file"-field as a csrf-token and throws the error.The first step to solve this problem is to render a csrf-token with this snippet in your form-element:

{{ form_widget(form) }}

Then you have to change your entity that it can handle multiple files. This can be done by implementing a one to many relation (upload (one) to file (many)).

In Symfony if you have error

Error: Call to a member function move() on a non-object

Try change

$files = $request->files

To

$files = $request->files->get('file');